Materials Literature
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Abstract Angle‐resolved XPS data (elemental quantification and high‐energy‐resolution C 1s) are presented for ten polymers with side‐chains of the form OCO(CF 2 ) y F, COO(CH 2 ) 2 OCO(CF 2 ) y F ( y = 1, 2, 3) and COO(CH 2 ) x (CF 2 ) y F ( x = 1, y = 1, 2, 3; x = 2, y = 8). Particular attention was paid to charge…
A hysteresis model based on the Jiles-Atherton theory is incorporated into a power transformer model in an electromagnetic transient program (EMTP)-type program. The eddy current effects are also included in the same model. Comparisons are made between recorded and simulated waveforms using a single-phase distribution…
A suggestion for substitutional Si doping in single-wall carbon nanotubes (SWNTs) through radial tube deformation is presented. Although the doping of buckyballs with substitutional Si atoms has been experimentally achieved, so far the synthesis of silicon-doped SWNT has not been reported. Using theoretical methods ba…
Abstract Sheet-like Bi2Fe4O9 nanoparticles were successfully synthesized by a rather facile hydrothermal process. Transmission electron microscopic (TEM) and selected area electron diffraction (SAED) studies show that the particles are sheet-like, about 30 nm in the direction of thickness. X-ray diffraction (XRD) anal…
The crystal and electronic structures of the entire series of alkali aluminum and alkali gallium tetrahydrides (ABH 4; A = Li, Na, K, Rb, or Cs; B = Al or Ga) are systematically investigated using an ab initio projected augmented plane-wave method. For structural stability studies, we have considered several possible…
Calcite crystals were nucleated and grown from supersaturated aqueous solutions in the presence of variable concentrations of lithium. The diagram of supersaturation vs [Li + ]/[Ca 2+ ] concentration ratio (“morphodrome”) shows a continuous habit variation, from the dominant {011̄1} rhombohedron (at low [Li + ]/[Ca 2+…
Directed catalyst evolution: IR-thermography and combinatorial library design (doping and composition spread) lead in a few generations to new, noble-metal-free catalysts for the low-temperature oxidation of CO in air. The picture shows the emissivity-corrected IR thermographic image of a catalyst library; the red dot…
We report the identification of the vacancy-hydrogen complex in single crystal diamond synthesized by chemical vapor deposition. The S=1 defect is observed by electron paramagnetic resonance in the negative charge state. The hydrogen atom is bonded to one of the carbon atoms neighboring the vacancy. Unlike the analogo…
Two new neutral thioantimonates(III) were first prepared by the reaction of elemental manganese, antimony, and sulfur in tren (tren = tris(2-aminoethyl)amine, C6H18N4) at 140 degrees C. In the amine-rich compound [Mn(tren)]2Sb2S5 (1) the trigonal SbS3 pyramids are connected via common corners (S(3)) into the tetradent…
We report room temperature angle-resolved photoemission experiments on $1T\ensuremath{-}{\mathrm{TaS}}_{2}$ and $1T\ensuremath{-}{\mathrm{TaSe}}_{2}$ complemented by density-functional theory calculations. Fermi-surface mapping experiments in the charge-density wave (CDW) phase are similar for the two compounds and do…
Abstract The deposition of Ce‐based conversion coatings onto 2024‐T3 Al alloy sheet was studied using Rutherford backscattering spectroscopy, scanning electron microscopy, Auger electron spectroscopy, x‐ray photoelectron spectroscopy and atomic force microscopy. The Al sheet was pretreated with an alkaline clean follo…
Stable polar oxide surfaces must be simultaneously electrostatically compensated and in thermodynamic equilibrium with the environment. As a paradigm, the MgO(111)-p(2x2) reconstructed surface is shown to involve combinations of Mg-covered terminations with peculiar insulating electronic structure, favored in O-poor c…
Abstract The spectroscopic and electrochemical examination of the mononuclear copper complexes of 5,10,15‐tris(pentafluorophenyl)corrole and 5,10,15‐tris(2,6‐dichlorophenyl)corrole ( 1a and 2a , respectively) and of the corresponding dinuclear corrole dimers 1b and 2b reveal the existence of two almost degenerate elec…
The coordination chemistries of the potential tetradentate ligands N,N'-bis(3,5-di-tert-butyl-2-hydroxyphenyl)ethylenediamine, H4[L1], the unsaturated analogue glyoxal-bis(2-hydroxy-3,5-di-tert-butylanil), H2[L2], and N,N'-bis(2-hydroxy-3,5-di-tert-butylphenyl)-2,2-dimethylpropylenediamine, H4[L3], have been investiga…
A convenient methodology has been developed for the synthesis of gadolinium−diethylenetriaminepentaacetic acid (Gd−DTPA)-terminated poly(propylene imine) dendrimers as contrast agents for magnetic resonance imaging (MRI). In our strategy, isocyanate-activated, tert -butyl-protected DTPA analogues were coupled to diffe…
Silicates, the most abundant minerals in the Earth's crust, have been successfully prepared as uniform nanotubes with high surface area and thermal stability (see picture). Preliminary studies suggest that such materials have great potential for use in gas adsorption and separation, as well as in catalytic processes.
Large-scale perpendicularly aligned helical carbon nanotube arrays were prepared by co-pyrolysis of Fe(CO)5 and pyridine onto the pristine quartz glass plates in a tube furnace at 900-1100 degrees C under a mixture flow of Ar and H2. The resultant aligned helical carbon nanotubes could not only facilitate the structur…
Regarded as the classic one-pot synthetic route to symmetrical porphyrins for well over half a century, pyrrole-aldehyde cyclocondensations have yielded a cornucopia of nonporphyrin macrocycles, such as N-confused porphyrins, corroles, sapphyrins, and expanded porphyrins, and have thus emerged as versatile self-assemb…
In this communication, solid-phase reactions for the synthesis of Lys-monofunctionalized gold nanoparticles are described. A controlled and selective fabrication of linear nanoparticle arrays can be achieved through peptide linkage systems, and therefore it is essential to prepare Fmoc amino acid nanoparticle building…
We present transport and thermal data for the quadruple-perovskites MCu3(Ti1-xRux)4O12 where 0 < x < 1. A metal-insulator transition (MIT) occurs for Ru concentrations x~0.75. At the same time, the Cu2+ antiferromagnetic state is destroyed and it's magnetic entropy suppressed by Ru on a 1:1 basis. This implies that ea…